All of a sudden noting works on my over the counter microwave.

There are no lights both overthe stove and inside the microwave. The exhaust fan does not work. The display is dead. Nothing works. My wife may have set the oven to cook for an hour instead of setting the timer as she intended. Could this be a fuse or is it the motherboard? how do i fine the fuses/circuit breakers inside the ove?. Is there a way to get the wiring diagram for this thing?

It may be as simple as a blown magnetron thermostat, and a fuse may have blown, but the magnetron may have been destroyed, too.

You didn't mention your model number, so I'll have to answer generically.

There
is often a "mini-manual" (tech sheet) hidden inside the unit
behind the
control panel or hidden on the left side behind the grille, which is
very helpful when troubleshooting, testing, and locating
components.

At
our Web site, we have a video
available showing how to remove a typical
over the range control panel assembly in under 5 minutes.

If you don't find your mini-manual,
or if you want to look at it before removing the controller, you might be able to download it here (just enter your model
number).You can find links to helpful exploded view diagrams and part ordering help here.

I recommend that you bookmark that link to your favorites.We're
happy to help you with free advice and we'd appreciate your thoughtful
rating of our answer.

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Over-the-range microwaves have lights and fans in them mostly for show. They protect the microwave from heat rising from the stove and provide a light to illuminate the stove top. The fan assembly is far too small to generate any real pull or draft and if it did, it would only blow it back in your face since these models do not exhaust to the outside; they only exhaust out the front of the microwave. A few models have a "filter screen" that is supposedly there to catch grease and contaminates but really it only serves to further weaken the draft as it provides a resistance to air flow.

Was it just the exhaust fan that came on? If so this is normal when cooking on the stove for long period of time without the fan running. The heat builds up under the microwave and eventually activates the fan.

You have a shorted grille relay on your control board. I can repair this for $69.95, which includes insured return shipping.
For details and more free DIY and other help & advice, feel free to contact me.

We see (and repair) this a lot. The problem is on the control panel, which we regularly repair nationwide by mail for $39.95 postpaid.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

This can often also affect the exhaust fan operation, too. The lights and fan can be inoperable or stuck on too.

Details of our service and critical safety information and disassembly information is at our site, and our link is at our listing here on FixYa: http://tinyurl.com/yzjozk

We're happy to help and we appreciate your thoughtful rating of our answer.